Cycles menu doesn't have setting required
If you can’t select the GPU in the render options, go to Edit > Preferences, then I think it’s System. There you will have boxes like CUDA, OpenCL etc. If you have a graphics card, it will be under one of those options. Make sure you check the box for it. Then you can go back to the render settings and you should be able to select your GPU.

Also, enabling the GPU won’t neccesarily give your renders less noise. It will just render faster than the CPU, which allows you to use higher samples for less noise.